mail.ozone.net has no MX records.
Question and response
Question
dig mail.ozone.net. MX
Answer
The response has no answer records.
Authority
ozone.net. 3600 SOA ns.ozone.net. admin.ozone.net. 2025071501 7200 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0